Was going to try figure out how to custom a normal dress into this as on a tight budget for this one, but wondered if someone here can make one cheap?

Wanting under £20 I know the material will be cheap and not a lot of detail but maybe someone kind can help me out? I'll take better measurements but I am around a 42/35/40 and would want it almost to the knees as I don't wanna flash my bum lol

I can understand having a tight budget but unless it's a friend that lives close to you and helps you make it, there's no way a good commissioner would take this job. I hope you can manage to sort something out though.

^ pretty much this. the fabrics and components just to make the costume would cost around that marker, and that's not including the time taken into making it which commissioners do charge for, I'm really sorry.